Possible surface defects caused by rolling of aluminium sheet and strip (7)

Possible surface defects caused by rolling of aluminium sheet and strip (7)

(23) Waves

Definition and characteristics: aluminum plate and strip due to uneven deformation and the formation of a variety of different uneven phenomenon of the general term. Plate, the edge of the strip produced by the wave called the edge of the wave, the middle of the wave called the middle of the wave, in the middle and the edge between neither in the middle nor in the two sides of the wave called two-ribbed wave, the size is smaller and usually round wave called broken wave.

The main reasons: unbalanced adjustment of the roll slit, roll type control unreasonable; uneven lubrication and cooling, so that the plate, strip deformation is uneven; unreasonable distribution of the amount of sub-pressing; bad incoming plate type; uneven use of winding tension.

(24) Warp

Definition and characteristics: After rolling or shearing, the edge of the aluminium sheet and strip warps.

The main causes: rolling when the amount of pressure is too large; rolling when the distribution of lubricant is not uniform.

(25) Rising edge

Definition and characteristics: aluminum sheet and strip curling process produced by the surface crease.

Main causes: thick head; poor bottoming; improper curling tension; sleeve is not round or prismatic.